/deep/.el-collapse-item__header
{
    // background-color: #ddedfb;
    padding-left: 10px;
    font-weight: bold; 
    font-size: 16px !important;
    margin: 0 auto !important; 
}
/deep/.el-collapse-item__content
{
    // background-color: #ddedfb;
    padding: 10px 20px;
}
/deep/.el-collapse { border-top: none; border-bottom: none; }